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st: equivalence limit for an inferiority test


From   Ricardo Ovaldia <ovaldia@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: equivalence limit for an inferiority test
Date   Sat, 15 Aug 2009 06:42:01 -0700 (PDT)

Dear all,

If I am interested in computing an equivalence limit of 20% around the diference of two proportions. Is this simply (-0.2, 0.2) or do I have to compute it based on the observed data and sample size (If yes, how)?

Thank you in advance,
Ricardo


Ricardo Ovaldia, MS
Statistician 
Oklahoma City, OK


--- On Fri, 8/14/09, Ricardo Ovaldia <ovaldia@yahoo.com> wrote:

> From: Ricardo Ovaldia <ovaldia@yahoo.com>
> Subject: Re: st: Re: equivalence test
> To: statalist@hsphsun2.harvard.edu
> Date: Friday, August 14, 2009, 11:34 AM
> Joseph Coveney <jcoveney@bigplanet.com>
> wrote:
> 
> >>You can use either -cs-, which is official, or
> -rdci-, [...]
> >>You would construct the confidence interval and
> check to see whether
> >>both lower and upper confidence bounds fall within
> the limits specified >>for accepting the alternative
> hypothesis of therapeutic equivalence.
> 
> Thank you. 
> As Joseph suggested, I used -rdci- and obtained an:
> Agresti-Caffo   95% CI: -0.299  0.067
> 
> If I am interested in an equivalence limit of 20%, do I
> compare the above 95%CI to (-0.2, 0.2)? Or how do I compute
> the correct equivalence limits?
> 
> Thank you,
> Ricardo
> 
> 
> Ricardo Ovaldia, MS
> Statistician 
> Oklahoma City, OK
> 
> 
> --- On Thu, 8/13/09, Ricardo Ovaldia <ovaldia@yahoo.com>
> wrote:
> 
> > From: Ricardo Ovaldia <ovaldia@yahoo.com>
> > Subject: Re: st: Re: equivalence test
> > To: statalist@hsphsun2.harvard.edu
> > Date: Thursday, August 13, 2009, 12:05 PM
> >  previously I asked:
> > 
> > > Is there a way to perform an equivalence test for
> a
> > 2x2 table.
> > > Treatment (0,1) vs. Outcome(0,1)?
> > 
> > I found -equip- by Richard Goldstein. Does this
> program
> > work correctly?
> > If yes, what is the meaning of test1 and test2?
> > if no, are there any alternatives (other free
> software)?
> > 
> > Thank you,
> > Ricardo.
> > 
> > Ricardo Ovaldia, MS
> > Statistician 
> > Oklahoma City, OK
> > 
> > 
> > --- On Wed, 8/12/09, Ricardo Ovaldia <ovaldia@yahoo.com>
> > wrote:
> > 
> > > From: Ricardo Ovaldia <ovaldia@yahoo.com>
> > > Subject: st: Re: equivalence test
> > > To: statalist@hsphsun2.harvard.edu
> > > Date: Wednesday, August 12, 2009, 6:01 PM
> > > Is there a way to perform an
> > > equivalence test for a 2x2 table.
> > > Treatment (0,1) vs. Outcome(0,1)?
> > > 
> > > Thank you,
> > > Ricardo
> > > 
> > > Ricardo Ovaldia, MS
> > > Statistician 
> > > Oklahoma City, OK
> > > 
> > > 
> > > 
> > > 
> > >       
> > > *
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> > 
> > 
> >       
> > 
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> > 
> 
> 
> 
> 


      

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